Supplanaxis is a genus of small sea snails, marine gastropod mollusks in the subfamily Planaxinae of the family Planaxidae. Species Species within the genus Supplanaxis include: Supplanaxis acutus (Krauss, 1848) † Supplanaxis beaumonti (Bayan, 1870) Supplanaxis leyteensis Poppe, Tagaro & Stahlschmidt, 2015 Supplanaxis nancyae (Petuch, 2013) Supplanaxis niger (Quoy & Gaimard, 1833) Supplanaxis nucleus (Bruguière, 1789) Supplanaxis obsoletus (Menke, 1851) Supplanaxis planicostatus (G. B. Sowerby I, 1825) Species brought into synonymy Supplanaxis abbreviatus (Pease, 1865): synonym of Supplanaxis niger (Quoy & Gaimard, 1833) Supplanaxis acuta [sic] : synonym of Supplanaxis acutus (Krauss, 1848) References Thiele, J. (1929-1935). Handbuch der systematischen Weichtierkunde. Jena, Gustav Fischer, 1154 pp External links Planaxidae